Best like for like battery I've ever used in a bike is an Odyssey, but they're expensive (!) and may not be an exact fit (you have to choose the nearest that'll go in the battery box). On the up side though they crank better and more reliably than anything else I've tried and last much longer (I have one that's 10yrs old and going strong).
I know what you mean about being a 'parts changer' so it might be good to check the charging side of the bike is doing its thing. The quick and dirty way to do that is to point the bike headlight at a wall on tickover and slowly raise the revs to around 2500. You should see the headlight get slightly brighter as the revs rise. It won't be much as the reg kicks in to stabiise it but if it does brighten it's likely the bike is charging ok. If it's not obvious then the next step is a multimeter. Having to use a charger overnight though is the clue it's the battery. I had to do the same thing with my Land Rover a few winters ago. A new battery fixed it.
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